The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 1997
Filed:
Apr. 20, 1995
Applicant:
Inventors:
Stephen M Bobbio, Wake Forest, NC (US);
Thomas D DuBois, Charlotte, NC (US);
Farid M Tranjan, Charlotte, NC (US);
George K Lucey, Jr, Burtonsville, MD (US);
James D Geis, Cheshire, CT (US);
Robert F Lipscomb, Chapel Hill, NC (US);
Timothy Piekarski, Charlotte, NC (US);
Assignee:
The University of North Carolina at Charlotte, Charlotte, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
228206 ; 228211 ; 228220 ;
Abstract
A fluxless soldering method utilizing a strongly internally bonded fluorine containing gas such as hydrogen fluoride (HF). The solder surface is exposed to the gas in place of a flux treatment, resulting in a modified surface layer which allows reflow or joining for an extended period.